A fire after business hours on a Sunday when they're pretty damned sure nobody's inside? Yes, be suspicious of this. Question remains: What artifacts were destroyed?
It houses several landmark collections including Egyptian artifacts and the oldest human fossil found in Brazil. http://news.trust.org//item/20180903001032-p13t9/
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Dsonophorus ago
I'm going to go with: it was a cover for removing specific items.
Enigmatic_Continuum ago
That's exactly what I'm thinking, and probably some stuff was meant to be destroyed, too. It's also possible that real artifacts were removed a long time ago and frauds put in their place.